It's not BMW, it's Microsoft. They use their version of the Bluetooth stack, not the Widcomm stack which is the industry standard. As such, the OBEX push will not work correctly on the MS BT stack which is what is needed for the address book transfer.

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2011 550xi Carbon Black/Oyster, M-Sport, Premium Package, Technology Package, Electronic Damper Control, Dynamic Drive, Comfort Access, Active Seats, Surround Cameras

2013 X5 5.0 Space Grey/Black, M-Sport, Premium Package, Technology Package, Comfort Access, Surround Cameras